HEMIPTERA. 15 I 
ground, but in the North it requires seventeen years for a 
nymph to reach maturity. 
More than twenty distinct broods of this species have 
been traced out. In many localities several broods coexist; 
this explains the fact that in such places these insects ap¬ 
pear several times during a single period of seventeen years. 
There is a common species of Cicada known as the Dog- 
day Harvest-fly or Lyreman, Cicada tibicen (Ci-ca'da ti-bi'cen), 
which requires only two years for its development, and as 
there are two broods of this species the adults appear every 
year. This Cicada (Fig. 184) is black and green in color, 
and more or less powdered beneath. And its song is the 
high, sharp trill that comes to us, midsummer noons, from 
the depths of trees where the singer is hidden amid the 
foliage, all unconscious that its shrill note has for centuries 
been a theme for poets. 
Family FULGORID^E (Ful-gor'i-dae). 
The Lantern-fly Family . 
This family is remarkable for certain exotic forms which 
it contains. Chief among these is the great Lantern-fly of 
Brazil, which is figured in many popular works on insects. 
Scarcely less strange are the Candle-flies of China and the 
East Indies. The popular names of these insects refer to 
the fact that they are phosphorescent, but we know of no 
native species that possesses this peculiarity. There does 
not seem to be any typical form of the body characteristic 
of this family. The different genera differ so greatly, that 
on superficial examination they appear to have very little in 
common. Some even resemble butterflies and moths, while 
others might easily be mistaken for neuropterous genera. 
The most useful character for recognizing these insects is 
the form and position of the antennas. These are bristle¬ 
shaped, and inserted in a button-shaped base on the side of 
